Finding mutual friends on facebook

Question

I want to find out mutual friends between two random users using the facebook Graph API v2.2.

I read through the documentation https://developers.facebook.com/docs/graph

Answer 1

It's an old question but now I've dealt with it so I'll write...

to get all mutual friends if you not his friend it's passible only from a server(in my case it's Node) as mention here: https://developers.facebook.com/docs/graph-api/reference/user-context/all_mutual_friends/

get the token of user-2 and YOUR auth-id, also generate appsecretProof and clientSecret from your Facebook admin panel of your app.

https://graph.facebook.com/v2.10/${auth_userId}? 
fields=context.fields%28all_mutual_friends.limit%28100%29%29 
&appsecret_proof=${appsecretProof}&access_token=${accessToken}

remember to ask permmision from users when they login and also send app review to Facebook to approve this feature.

with 'user_friends' permissions you can get from client only mutual friends that use in your app but not all mutual friends.